In FECINOR E. faecium is protected by layers of polysaccharides that allow it to pass through the stomach without being affected by acid pH and bile salts. On reaching the intestine, E.faecium multiplies at a rapid rate (doubling in CFU every 19 minutes, like E. coli strains) when compared to other lactic bacteria (40-60 min)).

It adheres to the intestinal wall forming an effective “biological barrier” which protects the intestine against pathogenic colonization.

During its multiplication FECINOR produces a large quantity of enzymes in sufficient amounts to make the nutrients in the feed more digestible.